File this one in the cease and desist department. Sources indicate the NHRA sent a letter to Texas Raceway in Kennedale, Texas, advising them to not run this weekend's ADRL event. The cause for this letter was the reported use of nitromethane in doorslammers and the lack of a supercharger overdrive rules. The sticking point is said to be insurance regulations. The event went forward as scheduled on Friday so time will tell on this situation.